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関連する概念動画

Semiconductors01:22

Semiconductors

1.3K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.3K
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

746
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
746
MOSFET Amplifiers01:17

MOSFET Amplifiers

460
The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
460
Non-ohmic Devices00:51

Non-ohmic Devices

1.4K
In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
1.4K
Biasing of FET01:22

Biasing of FET

653
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
653
Types of Semiconductors01:20

Types of Semiconductors

1.3K
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
1.3K

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関連する実験動画

Updated: Jan 8, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

8.8K

オンチップゲイン素子：集積フォトニクス向け

F T Albeladi, S Gillgrass, P Mishra

    Optics express
    |December 19, 2025
    PubMed
    まとめ
    この要約は機械生成です。

    MMIRを搭載した量子ドットゲインチップは、フォトニック集積回路向けのハイブリッド集積を簡素化します。これらのデバイスは閾値電流を大幅に低減し、スロープ効率を向上させるため、大規模応用にも最適です。

    キーワード:
    集積フォトニクス量子ドットゲインチップハイブリッド集積MMIRフォトニック集積回路

    さらに関連する動画

    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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    Generation and Coherent Control of Pulsed Quantum Frequency Combs
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    関連する実験動画

    Last Updated: Jan 8, 2026

    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
    12:19

    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

    Published on: April 4, 2017

    8.8K
    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
    05:57

    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

    Published on: April 1, 2020

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    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

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    科学分野:

    • フォトニクスおよび材料科学
    • 半導体デバイス工学

    背景:

    • アクティブゲイン素子とパッシブフォトニック集積回路（PIC）とのハイブリッド集積は、高度な光学システムにとって不可欠です。
    • III-V族半導体ゲイン材料は、PICにおける光増幅に不可欠です。
    • 効率的な結合と安定した性能は、ハイブリッド集積における重要な課題です。

    研究 の 目的:

    • ハイブリッド集積用の量子ドット（QD）ベースゲインチップの設計を調査すること。
    • マルチモード干渉反射器（MMIR）をゲインチップ内に組み込むことの利点を評価すること。
    • MMIR搭載ゲインチップが従来の構造と比較して提供する性能向上を評価すること。

    主な方法:

    • マルチモード干渉反射器（MMIR）を集積した量子ドットゲインチップの設計と製造。
    • MMIRを組み込んだリッジ導波路（RWG）レーザーの特性評価。
    • 閾値電流とスロープ効率に焦点を当てた、MMIRベースレーザーとファブリー・ペロー構造の性能比較。

    主要な成果:

    • MMIRを搭載した量子ドットゲインチップは、製造の容易さと強力なOバンド性能を示しました。
    • MMIRの組み込みにより、閾値電流が87%低減しました（1 mm長で46 mAに対し6 mA）。
    • ファブリー・ペロー設計を上回る90%以上のミラー反射率を示す、より高いスロープ効率が観察されました。

    結論:

    • MMIRを搭載したQDゲインチップは、ハイブリッド集積のための大幅な性能向上を提供します。
    • 1ポートおよび2ポート設計の両方が、大規模PICアプリケーション向けの導波路アライメントを簡素化します。
    • これらのゲインチップは、将来のPICにおける広範な採用のための有力な候補です。